SIGNIFICANT ACCOUNTING POLICIES - Summary of reconciliation of the cash balances reported on the balance sheets and the cash, cash equivalents and short-term restricted bank deposits balances (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
SIGNIFICANT ACCOUNTING POLICIES
Cash, and cash equivalents as reported on the balance sheets	$ 67,949	$ 35,808	$ 63,865
Short-term restricted bank deposits, as reported on the balance sheets	125		195
Cash, restricted cash, cash equivalents and restricted cash and cash equivalents as reported in the statements of cash flows	$ 68,074	$ 35,948	$ 64,060	$ 28,725